<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Hello World</title>
    <style>
        body {
            width: 660px;
            height: 660px;
            padding: 20px;
        }
        button{
            font-size: 24px;
            padding: 12px;
        }
    </style>
</head>

<body>
    <h1 id="message">Hello, World!</h1>
    <button id="changeColorButton">改变颜色</button>
    <button id="get-url-button">获取当前页面网址</button>
    <script src="popup.js"></script>
</body>

</html>